UVA 10994 Simple Addition

感觉这个一定要记下来涨教训啊。一开始找规律找错了。判断超麻烦还各种WA。浪费N个小时啊。。人家几行就A了。太弱，

#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <stack>
#include <queue>
#include <cctype>
#include <cstdio>
#include <string>
#include <vector>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
#define LL long long
#define PI 3.1415926535897932626
using namespace std;
int gcd(int a, int b) {return a % b == 0 ? b : gcd(b, a % b);}
long long p, q, t, tqm;
int tmp[15];

long long solve ( long long n ) {
    long long sum = 0;
    while ( n ) {
        sum += ( n / 10 ) * 45;
        sum += tmp[n % 10];
        n /= 10;
    }
    return sum;
}

int main ( ) {
    tmp[0] = 0;
    for ( int i = 1; i <= 9; ++i )
        tmp[i] = i + tmp[i - 1];

    while ( scanf ( "%lld%lld", &p, &q ) == 2 ) {
        if ( p < 0 && q < 0 ) break;
        if ( p > q ) tqm = p, p = q, q = tqm;

        printf ( "%lld
", solve ( q ) - solve ( p - 1 ) );
    }
    return 0;
}